ES347786A1 - Synchronizing system having locally generated signals and psk information signals - Google Patents

Synchronizing system having locally generated signals and psk information signals

Info

Publication number
ES347786A1
ES347786A1 ES347786A ES347786A ES347786A1 ES 347786 A1 ES347786 A1 ES 347786A1 ES 347786 A ES347786 A ES 347786A ES 347786 A ES347786 A ES 347786A ES 347786 A1 ES347786 A1 ES 347786A1
Authority
ES
Spain
Prior art keywords
phase
signals
oscillator
locally generated
synchronizing system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
ES347786A
Other languages
Spanish (es)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel Espana SA filed Critical Alcatel Espana SA
Publication of ES347786A1 publication Critical patent/ES347786A1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals
    • H04L27/2273—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals associated with quadrature demodulation, e.g. Costas loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end
    • H04L2027/0026—Correction of carrier offset
    • H04L2027/0028—Correction of carrier offset at passband only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0044—Control loops for carrier regulation
    • H04L2027/0046—Open loops
    • H04L2027/0048—Frequency multiplication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0044—Control loops for carrier regulation
    • H04L2027/0071—Control of loops
    • H04L2027/0073—Detection of synchronisation state

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

In a phase-shift telegraphy system wherein the carrier signal is either in phase or in quadrature phase, a local oscillator 6 is synchronized to the carrier frequency by means of two multipliers 5 and 7 to which the input signals are applied and which are supplied with in-phase and quadrature phase signals from the oscillator 6, the outputs of the multipliers being combined in a linear adder unit 9 and fed through a narrow-band filter 10 to control the frequency of oscillator 6. The output of unit 9 also supplies the demodulated output via a wider band filter 11. The phase shift unit 8 preferably alters the phase of the local oscillator in the opposite direction from that in which the carrier phase is shifted by the modulation.
ES347786A 1966-11-30 1967-11-29 Synchronizing system having locally generated signals and psk information signals Expired ES347786A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US59801666A 1966-11-30 1966-11-30

Publications (1)

Publication Number Publication Date
ES347786A1 true ES347786A1 (en) 1969-02-16

Family

ID=24393894

Family Applications (1)

Application Number Title Priority Date Filing Date
ES347786A Expired ES347786A1 (en) 1966-11-30 1967-11-29 Synchronizing system having locally generated signals and psk information signals

Country Status (6)

Country Link
US (1) US3472960A (en)
BE (1) BE707293A (en)
ES (1) ES347786A1 (en)
FR (1) FR1548756A (en)
GB (1) GB1195075A (en)
NL (1) NL6716346A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2047183B2 (en) * 1970-09-24 1972-11-16 Siemens AG, 1000 Berlin u. 8000 München METHOD AND CIRCUIT ARRANGEMENT FOR DEMODULATION AND PHASE DIFFERENCE MODULATED DATA SIGNALS
DE2047697B2 (en) * 1970-09-28 1972-11-23 Siemens AG, 1000 Berlin u. 8000 München CIRCUIT ARRANGEMENT FOR THE DEMODULATION OF PHASE DIFFERENCE MODULATED DATA SIGNALS
US3758870A (en) * 1972-02-23 1973-09-11 Sanders Associates Inc Digital demodulator
US3961136A (en) * 1975-04-25 1976-06-01 International Telephone And Telegraph Corporation Digital data transmit and receive channel modem
US4455664A (en) * 1981-12-07 1984-06-19 Motorola Inc. Carrier data operated squelch
US4672632A (en) * 1984-02-03 1987-06-09 Motorola, Inc. Optimized communications system and method employing channel synthesis and phase lock detection
US4587496A (en) * 1984-09-12 1986-05-06 General Signal Corporation Fast acquisition phase-lock loop

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3158864A (en) * 1960-12-27 1964-11-24 Space General Corp Self-synchronizing communication system
FR88714E (en) * 1963-06-28 1967-06-02
US3430143A (en) * 1965-03-15 1969-02-25 Gen Dynamics Corp Communications system wherein information is represented by the phase difference between adjacent tones
US3423529A (en) * 1966-02-01 1969-01-21 Bell Telephone Labor Inc Automatic phase recovery in suppressed carrier quadrature modulated biternary communication systems

Also Published As

Publication number Publication date
BE707293A (en) 1968-05-30
NL6716346A (en) 1968-05-31
FR1548756A (en) 1968-12-06
US3472960A (en) 1969-10-14
GB1195075A (en) 1970-06-17

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